如何在不改变ng-repeat的$ index的情况下使用ng-filter？

Question

目前,如果我过滤,$ index也会更新.因此,如果有500个结果,我过滤排名,也会更新.如何使索引列不更新？

这是我的代码:

<input ng-model="query.teamName" /></div>
<table class="table">
  <thead>
    <tr>
      <th>Rank</th>
      <th>Team</th>
      <th>Location</th>
      <th>Score</th>
    </tr>
  </thead>
  <tbody>
    <tr ng-repeat="team in teams | filter:query | orderBy:orderByScore:reverseSort">
      <td><span style="color:white">{{$index+1}}</span></td>
      <td>{{team.teamName}}</td>
      <td>{{team.teamLocation}}</td>
      <td>{{team.teamPoints | number:2}}</td>
    </tr>
  </tbody>
</table>

控制器:

scoreboard.controller('scoreboardCtrl', function ($scope, $filter) {

     $scope.orderByScore = 'teamPoints';
     $scope.reverseSort = true;

     $scope.teams = [
          { "teamName": "motorboat skydive", "teamLocation": "1189 King", "teamPoints": 35.53},
          { "teamName": "the grinders", "teamLocation": "1189 King", "teamPoints": 127.90},
          { "teamName": "team forrec", "teamLocation": "1189 King", "teamPoints": 29.46},
          { "teamName": "bikini finger", "teamLocation": "1189 King", "teamPoints": 21.98},
          { "teamName": "la familia", "teamLocation": "1189 King", "teamPoints": 148.32},
          { "teamName": "darkness is", "teamLocation": "1189 King", "teamPoints": 108.88},
          { "teamName": "grinders", "teamLocation": "1189 King", "teamPoints": 167.95},
          { "teamName": "discarded youth", "teamLocation": "1189 King", "teamPoints": 55.52}
          ];
     };

Answer 1

角度过滤器删除并添加新数组并更新ng-repeat,因此$index也将更新.相反,您可以初始化索引ng-init="idx=$index+1"并使用它.ng-init值永远不会被观看,也不会更新,但$index会根据数组中项目的迭代次数进行更改

<tr ng-repeat="team in teams  | filter:query | orderBy:orderByScore:reverseSort" ng-init="idx = $index+1">
    <td><span>{{idx}}</span></td>

Plnkr

由于索引在你的情况下是至关重要的,因为它是排名最好的方法来处理这可能是从控制器本身添加索引.

$scope.teams = [
          { "teamName": "motorboat skydive", "teamLocation": "1189 King", "teamPoints": 35.53},
          { "teamName": "the grinders", "teamLocation": "1189 King", "teamPoints": 127.90},
          { "teamName": "team forrec", "teamLocation": "1189 King", "teamPoints": 29.46},
          { "teamName": "bikini finger", "teamLocation": "1189 King", "teamPoints": 21.98},
          { "teamName": "la familia", "teamLocation": "1189 King", "teamPoints": 148.32},
          { "teamName": "darkness is", "teamLocation": "1189 King", "teamPoints": 108.88},
          { "teamName": "grinders", "teamLocation": "1189 King", "teamPoints": 167.95},
          { "teamName": "discarded youth", "teamLocation": "1189 King", "teamPoints": 55.52}
          ]
   .sort(function(itm1, itm2){ return itm2.teamPoints - itm1.teamPoints }) //Sort teams

   .map(function(itm, idx){ itm.index = (idx+1); return itm;  }); //assign rankings

我使用本机排序或者只是在控制器中使用角度orderByFilter本身为初始集合(并从视图中删除ng-init变量赋值的逻辑).因此,您不会运行运行时$ index问题.

Plnkr2